This thesis summarizes own research regulating the turnover of organic matter in soils of different cosystems between the Arctic and the tropics. The main focus lies on the microbial formation, oxidation and release of the two most important greenhouse gases carbon dioxide (Co2) and methane and the response of the involved processes on changing environmental and climatic conditions. Thereforre, field mesaurements in northern Russia, Germany and the Philippines werde conducted and combined with laboratory experiments to address specific research questins under controlled conditions. Organic carbon stock in soils, Formation and mineralization of soil organic matter ; microbial methane production and oxidation in soils , Fluxes of carbon dioide and methane between land and atmosphere , modelling the terrestrial carbon cycle , regulation of methane oxidation in permaforst soils of the Siberian arctic tundra , methane fluxes , Samoylov Island ; Kurungnakh Island ; Mamontov Klyk, In situ activities and abdundance of methane bacteria , efficiency of methane oxidation , interaction between methane oxidizers and mosses , methane oxidation in subsea permafrost , decomposability of organic matter from thawing permafrost , release of trace gasses from thawing permafrost , carbon dioxide and methane production in laoratory incubations, comparison of field with laboratory incubations , degradability of permaforst organic matter, mitigation of greenhouse gas release from agricultural soils f different climate zones , impact of biochar on greenhouse gas formation and release in paddy soils , decomposition of biochar in laboratory incubations , impact of rice residue management on greenhouse gas fluxes from paddy soils , biochar application on soils intensivly used for bioenergy crop production, soil properties and nutrient availability , crop yield , soil microbial biomasse , soil carbon turnover in laboratory incubations , carbon dioxide fluxes.
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